180 g glucose is dissolved in 90 g water. What is the mole fraction of glucose?
Answer and explanation
Correct answer: 1/6
Glucose has molar mass 180 g mol−1, so 180 g glucose is 1 mol. Water has molar mass 18 g mol−1, so 90 g water is 5 mol. Total moles are 1 + 5 = 6 mol. Hence the glucose mole fraction is 1/6, approximately 0.167. The larger glucose mass does not mean a larger mole fraction because glucose molecules are much heavier than water molecules.
Frequently asked questions
What is the correct answer to this question?
1/6
Why is this the correct answer?
Glucose has molar mass 180 g mol−1, so 180 g glucose is 1 mol. Water has molar mass 18 g mol−1, so 90 g water is 5 mol. Total moles are 1 + 5 = 6 mol. Hence the glucose mole fraction is 1/6, approximately 0.167. The larger glucose mass does not mean a larger mole fraction because glucose molecules are much heavier than water molecules.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
